Ammo is the other half of the suppression equation, especially in regards to subsonic rounds. I have an Octane 9, and my full power 147 gr handloads still turn heads at the range. It's really about the powder used in the round. A lot of the 147 gr stuff on the shelf is still pretty crappy. If you want store bought, I've heard the Federal Syntech rounds are about as good as it gets and are fairly available.